What It Is:
Onsior is the brand name for robenacoxib, a non steroidal anti inflammatory drug (NSAID) approved specifically for use in cats. It is used to manage pain and inflammation, especially after surgery or dental procedures.
Unlike many NSAIDs that are risky for cats, Onsior is FDA approved and designed to be safe for short term use in cats.
🐾 Common Uses
Onsior is commonly prescribed for:
- Pain relief after spay or neuter surgery
- Dental extractions or oral surgery
- Soft tissue surgery
- Minor injuries or acute inflammation
- Short term pain management
- Early arthritis flare ups in some cases
It is often used for three to six days and is rarely prescribed long term.
🧪 How It Works
Onsior works by blocking the COX 2 enzyme, which plays a key role in inflammation and pain. This reduces:
- Swelling
- Pain
- Fever
Because it targets COX 2 more than COX 1, Onsior tends to cause fewer side effects than other NSAIDs in cats.
💊 Dosage and Administration
Onsior is available as small tablets or injectable medication. It is most often given in tablet form at home.
- Tablets are given once daily for up to three days in most surgical cases
- In some cases, vets may extend use up to six days based on your cat’s condition
- Onsior tablets should be given with or shortly after food
- Never give a higher dose or extend treatment without your vet’s instruction
Only cats six months or older and weighing at least five and a half pounds should receive Onsior.
⚠️ Potential Side Effects
Onsior is generally well tolerated but can cause side effects in some cats, especially if given improperly.
Possible side effects include:
- Vomiting
- Diarrhea
- Decreased appetite
- Lethargy
- Elevated liver or kidney values
- Rarely, stomach ulcers or bleeding
Tell your vet right away if your cat shows signs of vomiting, loss of appetite, or any unusual behavior while on Onsior.
🩺 Monitoring and Safety
Onsior is intended for short term use only. Cats have a limited ability to process NSAIDs, so prolonged use increases risk.
Your vet may avoid Onsior in cats with:
- Kidney or liver disease
- Dehydration
- Bleeding disorders
- Previous NSAID sensitivity
- Use of other NSAIDs or corticosteroids
Bloodwork may be required before or during treatment in higher risk cats.
💡 Cat Owner Note
If your cat has just had surgery or a dental procedure, Onsior may be part of their recovery plan. It helps reduce pain and inflammation without heavy sedation, so your cat can feel better faster. Be sure to give the correct dose on time and always finish the full treatment course.
❓ Frequently Asked Questions About Onsior in Cats
Is Onsior safe for cats?
Yes. It is one of the few NSAIDs approved for cats and is generally safe when used as directed.
How long can a cat take Onsior?
Most cats receive it for three to six days. Longer use increases the risk of side effects.
Can I give Onsior with other pain medications?
Do not combine Onsior with other NSAIDs or steroids. Your vet may prescribe other medications that are safe to use alongside it.
Does Onsior need to be given with food?
It is best to give it with or shortly after food to reduce the chance of stomach upset.
Can I reuse Onsior from a previous surgery?
No. Always follow your vet’s current instructions. Do not reuse medication without approval.
What should I do if I miss a dose?
Give the dose as soon as possible. If it is almost time for the next dose, skip the missed one. Do not double up.